Java generics parameter bounding to any of a range of types

Question

Is there a syntax or workaround to constrain a generic type parameter to any of a range of types?

I am aware that you can constrain a type to be all

Answer 1

The following code would do the same thing as in the provided example, but without runtime type checking and typecasts.

public boolean sameAs(MyClass obj) {
    return this.id.equals(obj.id);
}
public boolean sameAs(String obj) {
    return this.id.equals(obj);
}

NPE checking might be a good idea.